Anodic stripping voltammetry of gold nanoparticles at boron-doped diamond electrodes and its application in immunochromatographic strip tests

• Published in: Talanta (Oxford) Vol. 134; pp. 136 - 143
• Main Authors: Ivandini, Tribidasari A., Wicaksono, Wiyogo P., Saepudin, Endang, Rismetov, Bakhadir, Einaga, Yasuaki
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-03-2015
• Subjects: Animals; Anodic stripping; Anodic stripping voltammetry; Antibodies - chemistry; Antibodies - immunology; Boron - chemistry; Boron-doped diamond electrode; Chromatography - methods; Diamond - chemistry; Diamonds; Electrochemistry; Electrodes; Gold; Gold - chemistry; Gold nanoparticles; Immunochromatographic strip tests; Melamine; Metal Nanoparticles - chemistry; Milk - chemistry; Oxidation; Strip; Triazines - analysis; Triazines - immunology; Voltammetry; Immunochromatographic strip tests; Boron-doped diamond electrode; Melamine; Anodic stripping voltammetry; Gold nanoparticles
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2014.11.010

Anodic stripping voltammetry (ASV) of colloidal gold-nanoparticles (AuNPs) was investigated at boron-doped diamond (BDD) electrodes in 50mM HClO4. A deposition time of 300s at−0.2V (vs. Ag/AgCl) was fixed as the condition for the ASV. The voltammograms showed oxidation peaks that could be attributed to the oxidation of gold. These oxidation peaks were then investigated for potential application in immunochromatographic strip tests for the selective and quantitative detection of melamine, in which AuNPs were used as the label for the antibody of melamine. Linear regression of the oxidation peak currents appeared in the concentration range from 0.05–0.6μg/mL melamine standard, with an estimated LOD of 0.069μg/mL and an average relative standard deviation of 8.0%. This indicated that the method could be considered as an alternative method for selective and quantitative immunochromatographic applications. The validity was examined by the measurements of melamine injected into milk samples, which showed good recovery percentages during the measurements.
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•AuNPs were used as the label for antibody in immunochromatographic strip test.•Anodic stripping voltammetry was used to determine the quantity of AuNPs.•Quantity of AuNPs labeled to melamine antibody was equivalent to melamine concentration.•The method was promising for selective and quantitative melamine detection.